I answered and it was Cindy, asking how I was doing today. I asked if she was with the pool company. She said no, I said sorry, and I hung up. I called back and number was a disconnected one. Spam call, just block the number.
They called again today. I apparently forgot to block the number last time. Anyway, I didn't answer and they left no message. Must not be important to them. Number is now (really this time) blocked!